JP5294050B2 - Preforms and containers - Google Patents

Description

  The present invention relates to a preform having a mouth portion, a preform body, and a flange portion formed between the mouth portion and the preform body, and a container made from such a preform. The present invention relates to a preform and a container that can break a cap body and a ring at a small rotation angle when opening.

  Conventionally, a plastic bottle container made of PET or the like has been manufactured by biaxial stretch blow molding of a preform (preliminary molded body) produced by injection molding. As such a preform, for example, a preform as shown in FIG. 13 is used (conventional example 1). In FIG. 13, the preform 100 has a mouth portion 101, a preform body 102, and a flange portion 103. In FIG. 13, an annular protrusion (cabler part) 104 is formed over the entire circumference of the mouth part 101 above the flange part 103.

  In the preform 100 (conventional example 1) shown in FIG. 13, since the annular protrusion 104 is provided on the entire circumference of the mouth portion 101, the cap ring does not fall off the mouth portion 101 after the cap is opened. However, when opening the cap, it is necessary to rotate the cap by a large angle in order to break the cap body and the ring of the cap.

  On the other hand, the preform 110 (conventional example 2) shown in FIGS. 14 and 15 is provided with four ratchet claws 114 along the outer periphery of the mouth 111 above the flange 113. With such a structure, the cap main body and the ring can be broken at a small rotation angle by engaging the protrusion on the inner surface of the ring of the cap with the ratchet pawl 114 when opening the cap.

However, as shown in FIG. 15, the circumferential length L _X of each ratchet claw 114 of the preform 110 is shorter than the interval L _Y between the ratchet claws 114. For this reason, there exists a problem that a container falls easily from the neck gripper inserted between the flange part 113 and the ratchet nail | claw 114 during conveyance in a manufacturing process. There is also a problem that after the cap is opened, the ring of the cap easily gets over the ratchet pawl 114 and falls off from the mouth portion 111.
JP 2006-263948 A

  The present invention has been made in consideration of such points, and when opening the cap, the cap body and the ring can be broken at a small rotation angle, so that they do not fall during transportation in the manufacturing process. An object of the present invention is to provide a preform and a container in which the ring does not easily fall off from the mouth after opening.

The present invention relates to a preform having a mouth portion, a preform body, and a flange portion formed between the mouth portion and the preform body. parts are formed, at a position between the male screw portion and the flange portion of the mouth portion outer periphery, a plurality provided ratcheting pawl at predetermined intervals in the circumferential direction, the ratchet pawl is arranged between the ratchet pawl The ring is ruptured from the cap body by circumferentially engaging a protrusion on the inner surface of the ring of the cap, and the circumferential length L ₁ of each ratchet claw and the distance L ₂ between the ratchet claws. is to satisfy the relationship L _1> L _2, the angle alpha of each ratchet pawl relative to the center of the mouth, which is 45 ° <alpha preform, characterized in that a <70 °.

  The present invention is the preform characterized in that each ratchet claw includes a main body portion that engages with a protrusion on the inner surface of the ring of the cap, and an extension portion that is integrally connected to the ratchet claw main body and extends in the circumferential direction. is there.

  The present invention is the preform characterized in that the lower surface of the main body portion and the lower surface of the extension portion of each ratchet claw are located on the same plane.

  The present invention is the preform characterized in that the radial width of the main body portion of each ratchet claw is longer than the radial width of the extension portion.

  The present invention is the preform characterized in that the height of the main body portion of each ratchet claw is longer than the height of the extension portion.

The present invention relates to a container having a mouth portion, a container body, and a flange portion formed between the mouth portion and the container body, and a male thread portion that engages with a female thread portion on the inner surface of the cap is formed on the outer periphery of the mouth portion. to a position between the male screw portion and the flange portion of the mouth portion outer periphery, ratcheting pawl is provided a plurality at predetermined intervals in the circumferential direction, the ratchet pawl, the cap disposed between the ratchet pawl The ring is ruptured from the cap body by engaging the protrusion on the inner surface of the ring in the circumferential direction. The circumferential length L ₁ of each ratchet claw and the distance L ₂ between each ratchet claw are L _1> meets the relationship of L _2, the angle alpha of each ratchet pawl relative to the center of the mouth portion, a container which is characterized in that the 45 ° <α <70 °.

As described above, according to the present invention, the circumferential length L ₁ of each ratchet claw and the distance L ₂ between each ratchet claw satisfy the relationship L ₁ > L _2. The cap main body and the ring can be broken at a small rotation angle, and the preform does not fall during conveyance in the manufacturing process. Further, after opening, the broken ring does not fall over the ratchet claw and fall off from the mouth.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing a preform according to this embodiment, and FIG. 2 is a top view showing the preform according to this embodiment (viewed in the direction of arrow II in FIG. 1). FIG. 3 is a vertical sectional view (sectional view taken along line III-III in FIG. 2) showing the preform according to the present embodiment, and FIG. 4 is a horizontal sectional view (shown in FIG. 1) showing the preform according to the present embodiment. IV-IV line sectional view). FIG. 5 is an enlarged view of the ratchet claw, and FIG. 6 is an enlarged view of a VI portion of FIG. FIG. 7 is a vertical sectional view of the cap, and FIG. 8 is a vertical sectional view showing the container and the assembly according to the present embodiment. FIG. 9 is a diagram illustrating a method for manufacturing a preform, a container, and a combination, and FIG. 10 is a diagram illustrating a neck gripper that conveys the container. FIG. 11 is a partially enlarged sectional view showing the container and the cap before the cap body and the ring are broken. FIG. 12 is a partially enlarged sectional view showing the container and the cap after the cap body and the ring are broken. FIG.

Preform Configuration First, an outline of a preform according to the present embodiment will be described with reference to FIGS.

  The preform 10 shown in FIGS. 1 to 3 is manufactured by injection molding plastic pellets made of, for example, PET (polyethylene terephthalate). This preform 10 is formed between a mouth portion 11 having a circular opening 11a formed at the upper end, a bottomed cylindrical preform body 12, and between the mouth portion 11 and the preform body 12, and outwardly. And a flange portion 13 that protrudes from the bottom.

  Among these, the external thread part 14 engaged with the internal thread part 25 of the cap 20 inner surface mentioned later is formed in the outer periphery of the opening | mouth part 11. As shown in FIG.

  Further, a plurality of ratchet claws 15 are provided at predetermined positions in the circumferential direction (four locations in the present embodiment) at positions between the male screw portion 14 and the flange portion 13 in the outer periphery of the mouth portion 11 ( (See FIG. 4). As will be described later, the ratchet pawl 15 is engaged with a protrusion 28 on the inner surface of the ring 22 of the cap 20 in the circumferential direction to break the ring 22 from the cap body 21.

Further, as shown in FIG. 4, the circumferential length L ₁ of each ratchet pawl 15 and the distance L ₂ between the ratchet pawls 15 satisfy the relationship of L ₁ > L ₂ . In FIG. 4, the angle α of each ratchet claw 15 with respect to the center O of the mouth portion 11 is preferably 45 ° <α <70 °. If the angle α of each ratchet claw 15 is 45 ° or less (α ≦ 45 °), the preform 10 is likely to drop during conveyance in the manufacturing process, and the ring 22 that is broken after opening the plug overcomes the ratchet claw 15. It is easy to drop off from the mouth portion 11. On the other hand, when the angle α of each ratchet claw 15 exceeds 70 ° (70 ° <α), the gap between each ratchet claw 15 becomes small, and when the cap 20 is attached to the preform 10 (or a container 30 described later), It becomes difficult to arrange the protrusions 28 on the inner surface of the ring 22 of the cap 20 between the ratchet claws 15.

  Each ratchet claw 15 includes a main body portion 15a that engages with the protrusion 28 on the inner surface of the ring 22 of the cap 20, and an extension portion 15b that is integrally connected to the main body of the ratchet claw 15 and extends in the circumferential direction.

As shown in FIG. 5, the lower surface 15c of the main body portion 15a of each ratchet claw 15 and the lower surface 15d of the extension portion 15b are located on the same plane. Thereby, the ring 22 can be stably held between the flange portion 13 and the ratchet claw 15 after the cap 20 is opened. The main body 15a and the extension 15b of each ratchet claw 15 have horizontal upper surfaces 15e and 15f, respectively, and an inclined portion 15g is formed between the upper surface 15e and the upper surface 15f. In FIG. 5, the distance d ₁ between the main body portion 15 a of each ratchet claw 15 and the lower surfaces 15 c and 15 d of the extension portion 15 b and the flange portion 13 is preferably 2 mm ≦ d ₁ ≦ 5 mm.

The height h ₁ of the main body 15a of each ratchet pawl 15 is longer than the height h ₂ of the extension 15b (h ₁ > h ₂ : see FIG. 5). In this case, the height h ₁ of the main body portion 15a is preferably 1.0 mm ≦ w ₁ ≦ 2.5 mm, and the height h ₂ of the extension portion 15b is 0.5 mm ≦ w ₂ ≦ 1.5 mm. It is preferable to become. On the other hand, as shown in FIG. 6, the radial width w ₁ of the main body 15a of each ratchet pawl 15 is longer than the radial width w ₂ of the extension 15b (w ₁ > w ₂ ). In this case, the radial width w ₁ of the main body portion 15a is preferably 0.5 mm ≦ w ₁ ≦ 1.5 mm, and the radial width w ₂ of the extension portion 15b is 0.25 mm ≦ w _2. It is preferable that ≦ 1.0 mm. Here, “height” refers to the distance along the longitudinal direction of the preform 10, and “radial width” refers to the distance along the radial direction of the circle with reference to the center O of the mouth 11. Say.

Configuration of Cap Next, the configuration of the cap will be described with reference to FIG.

  The cap 20 includes a cap main body 21 and a ring 22 attached to the cap main body 21 so as to be capable of being broken. The cap body 21 and the ring 22 are integrally formed of a synthetic resin such as PE. Between the cap main body 21 and the ring 22, an annular fracture portion 20a that is thinner than the periphery is formed, and the cap main body 21 and the ring 22 can be fractured along the fracture portion 20a.

  The cap main body 21 has a flat plate-shaped top surface portion 23, a cylindrical portion 24 extending from the top surface portion 23, and a female screw portion 25 formed on the inner surface of the cylindrical portion 24. A circular protrusion 26 is provided on the inner surface of the top surface portion 23 of the cap body 21. The circular protrusion 26 engages with the inner surface of the mouth portion 11 of the preform 10 (or container 30) when the cap 20 is attached to the preform 10 (or container 30 described later).

  On the other hand, the ring 22 has a ring body 27 that is continuous with the cylindrical portion 24 of the cap body 21, and a protrusion 28 that is provided on the inner surface of the ring body 27 and extends obliquely inward from the lower end of the ring body 27. Of these, the protrusions 28 are engaged with the main body 15a of the ratchet pawl 15 as described above, and a plurality of protrusions 28 (in the present embodiment, in the circumferential direction corresponding to the ratchet pawl 15). 4 places).

Configuration of Container and Combination Next, the configuration of the container and the combination according to the present embodiment will be described with reference to FIG.

  In FIG. 8, the shape of the container main body 31 is different from the shape of the preform main body 12 described above, and the other configuration is the same as that of the preform 10 described above. The combined body 40 is a combination of the container 30 and the cap 20 shown in FIG. 8, the same parts as those in FIGS. 1 to 7 are denoted by the same reference numerals, and detailed description thereof is omitted.

  A container 30 shown in FIG. 8 is produced by biaxially stretch blow-molding the preform 10 shown in FIGS. The container 30 includes a mouth portion 11 to which the cap 20 is attached, a container body 31 formed by stretching the preform body 12, and a flange portion 13 formed between the mouth portion 11 and the container body 31. And have.

  The shape of the container main body 31 may be any shape as long as the preform main body 12 is formed by biaxial stretch blow molding, and is not limited to the shape shown in FIG.

  Moreover, the union body 40 is comprised from the cap 20 shown in FIG. 7, and the container 30 mentioned above. That is, the cap 20 is attached to the container 30 by screwing the female screw portion 25 of the cap body 21 with the male screw portion 14 of the mouth portion 11. In FIG. 8, the protrusions 28 of the ring 22 are located between the ratchet claws 15.

That is, the combined body 40 includes a cap body 21 having a cap main body 21 having an internal thread portion 25, a ring 22 attached to the cap main body 21 so as to be broken, a mouth portion 11 to which the cap 20 is mounted, and a container main body 31. And the container 30 having the flange portion 13 formed between the mouth portion 11 and the container body 31, the outer periphery of the mouth portion 11 of the container 30 is engaged with the female screw portion 25 on the inner surface of the cap 20. A mating male screw portion 14 is formed, and the ring 22 is engaged with the protrusion portion 28 on the inner surface of the ring 22 of the cap 20 in the circumferential direction at a position between the male screw portion 14 and the flange portion 13 in the outer periphery of the mouth portion 11. the ratchet pawl 15 to break from the cap body 21 is provided with a plurality at predetermined intervals in the circumferential direction, the circumferential length L ₁ of each ratchet pawl 15, the ratchet pawl 15 Distance L ₂ of the satisfy a relationship of L _1> L _2.

Operation of the present embodiment Next, the operation of the present embodiment having such a configuration will be described.

  First, a method for manufacturing the preform 10 shown in FIGS. 1 to 3, the container 30 shown in FIG. 8, and the combined body 40 shown in FIG. 8 will be described with reference to FIGS.

  First, the preform 10 shown in FIGS. 1 to 3 is manufactured by injection-molding pellets made of, for example, PET resin using an injection molding machine (reference numeral 51 in FIG. 9).

  Next, the preform 10 is heated and then subjected to biaxial stretch blow molding with a blow molding machine to produce the container 30 shown in FIG. 8 (reference numeral 52 in FIG. 9).

Then, the container 30 is conveyed by the neck gripper (conveyance apparatus) 60 which has a pair of arms 61 and 62, as shown in FIG. During transport, the pair of arms 61 and 62 of the neck gripper 60 are inserted between the flange portion 13 of the container 30 and the ratchet pawl 15. In this state, the neck gripper 60 holds the ratchet pawl 15 and conveys the container 30. In this case, as described above, the relationship between the circumferential length L ₁ of each ratchet pawl 15 and the distance L ₂ between the ratchet pawls satisfies the relationship L ₁ > L ₂ . Therefore, the contact area between the arms 61 and 62 and the ratchet pawl 15 is increased, and the container 30 can be reliably transported by the neck gripper 60 regardless of the position of each ratchet pawl 15.

  On the other hand, in parallel with manufacturing the container 30, the cap 20 having the cap body 21 and the ring 22 is separately manufactured by injection molding (reference numeral 53 in FIG. 9).

  Thereafter, the cap 20 is pushed into the container 30 while being rotated clockwise as viewed from above the container 30 to attach the cap 20 to the container 30 to produce a combined body 40 (reference numeral 54 in FIG. 9). At this time, the female threaded portion 25 of the cap body 21 is screwed into the male threaded portion 14 of the container 30, and the protrusions 28 on the inner surface of the ring 22 are disposed between the ratchet claws 15 (FIG. 11).

  Next, the effect | action at the time of opening the cap 20 from the container 30 is demonstrated using FIG. 11 and FIG.

  First, in the state shown in FIG. 11, the cap 20 is rotated counterclockwise with respect to the container 30 when viewed from above the container. At this time, the cap main body 21 rotates so that the female screw portion 25 follows the male screw portion 14 of the container 30. On the other hand, the ring 22 stops when each projection 28 engages with the main body 15a of each ratchet pawl 15 in the circumferential direction. When the cap 20 is further rotated, the cap body 21 and the ring 22 are broken at the breaking portion 20a (FIG. 12). Thereafter, the cap body 21 is removed from the container 30.

After the cap 20 is thus opened, the ring 22 remains between the flange portion 13 of the container 30 and the ratchet pawl 15. In this case, since the circumferential length L ₁ of each ratchet pawl 15 and the distance L ₂ between the ratchet pawls 15 satisfy the relationship L ₁ > L ₂ , the ring 22 gets over the ratchet pawl 15 and opens the mouth. It does not fall off from the part 11.

Thus, according to the present embodiment, the circumferential length L ₁ of each ratchet pawl 15 and the distance L ₂ between the ratchet pawls 15 satisfy the relationship L ₁ > L _2. When opening the cap, the cap body 21 and the ring 22 can be broken at a small rotation angle. Further, the container 30 does not fall from the neck gripper 60 during conveyance in the manufacturing process. Further, after the cap 20 is opened, the ring 22 does not get over the ratchet pawl 15 and drop off from the mouth 11 of the container 30.

(Example)
Next, specific examples of the present invention will be described.

  First, preforms 10 shown in FIG. 1 were produced by injection molding under the following conditions (30 pieces). As a comparative example, preforms 110 shown in FIG. 14 were produced under the same conditions (30 pieces).

Injection material: SHINPET 5015W
Injection molding machine: FE160 (Manufacturer: Nissei Plastic Industry)

  Next, the container 30 was produced by blow-molding each preform 10 based on the following conditions. Similarly, each preform 110 (comparative example) was blow-molded to produce a container as a comparative example.

Blow molding machine: LB-01 (SIG Corpoplast)
Container weight: about 21g

Next, the cap 20 was attached to each container (the container 30 of this example and the container of the comparative example, the same applies hereinafter), and then immediately opened. As a result, the ring 22 of the cap 20 was broken from the cap body 21, and the ring 22 remained in each container. Thereafter, these containers were divided into groups of 10 and left for 1 week under conditions of 3 ° C., 22 ° C., and 40 ° C., respectively. Then, the test which confirms whether the ring 22 falls from each container was done. This test method uses the opening and closing meter of “AUTOMATIC TORQUE ANALYZER KE-10” manufactured by Kyoto Giken, tightens the cap 20 to the container 30 with a force of 150 N · cm, and uses the same device to open the cap. It is a thing.

  As a result, in the container as a comparative example, all the rings 22 dropped out under all temperature conditions, whereas in the container 30 of this example, no ring 22 dropped out under all temperature conditions.

The front view which shows the preform by one embodiment of this invention. The top view which shows the preform by one embodiment of this invention (II direction arrow line view of FIG. 1). FIG. 3 is a vertical sectional view (a sectional view taken along line III-III in FIG. 2) showing a preform according to an embodiment of the present invention. The horizontal sectional view (IV-IV line sectional view of Drawing 1) showing the preform by one embodiment of the present invention. Enlarged view of ratchet claw. The VI section enlarged view of FIG. The vertical sectional view of a cap. 1 is a vertical sectional view showing a container and an assembly according to an embodiment of the present invention. The figure which shows the manufacturing method of a preform, a container, and an assembly. The figure which shows the neck gripper which conveys a container. The partial expanded sectional view which shows the container and cap before a cap main body and a ring are fractured | ruptured. The partial expanded sectional view which shows the container and cap after a cap main body and a ring are fractured | ruptured. The front view which shows the conventional preform. The front view which shows another conventional preform. XV-XV sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Preform 11 Mouth part 12 Preform main body 13 Flange part 14 Male thread part 15 Ratchet claw 15a Main body part 15b Extension part 20 Cap 21 Cap main body 22 Ring 25 Female thread part 28 Projection part 30 Container 31 Container main body 40 Assembly

Claims (6)

In a preform having a mouth portion, a preform body, and a flange portion formed between the mouth portion and the preform body,
On the outer periphery of the mouth, a male thread part that engages with the female thread part on the inner surface of the cap is formed,
A position between the male screw portion and the flange portion of the mouth portion outer periphery, ratcheting pawl is provided a plurality at predetermined intervals in the circumferential direction,
The ratchet pawl is to break the ring from the cap body by engaging in a circumferential direction with a protrusion on the inner surface of the ring of the cap disposed between the ratchet pawls.
The circumferential length L ₁ of each ratchet pawl, the distance L ₂ between the ratchet pawl, meets the relationship of L _1> L _2,
The preform characterized in that the angle α of each ratchet claw with respect to the center of the mouth is 45 ° <α <70 ° .   2. A preform according to claim 1, wherein each ratchet claw includes a main body portion that engages with a protrusion on the inner surface of the ring of the cap, and an extension portion that is integrally connected to the ratchet claw main body and extends in the circumferential direction. .   The preform according to claim 2, wherein the lower surface of the main body portion and the lower surface of the extension portion of each ratchet claw are located on the same plane.   4. The preform according to claim 2, wherein a radial width of the main body portion of each ratchet claw is longer than a radial width of the extension portion.   The preform according to any one of claims 2 to 4, wherein the height of the main body portion of each ratchet claw is longer than the height of the extension portion. In a container having a mouth portion, a container body, and a flange portion formed between the mouth portion and the container body,
On the outer periphery of the mouth, a male thread part that engages with the female thread part on the inner surface of the cap is formed,
A position between the male screw portion and the flange portion of the mouth portion outer periphery, ratcheting pawl is provided a plurality at predetermined intervals in the circumferential direction,
The ratchet pawl is to break the ring from the cap body by engaging in a circumferential direction with a protrusion on the inner surface of the ring of the cap disposed between the ratchet pawls.
The circumferential length L ₁ of each ratchet pawl, the distance L ₂ between the ratchet pawl, meets the relationship of L _1> L _2,
An angle α of each ratchet claw with respect to the center of the mouth portion is 45 ° <α <70 ° .

Images